rpcbinding: properly add imports for simple types of event parameters

There are two ways of doing this: first one is to emit all notifications
parameter data into rpcbindings configuration on compile time (event if
the parameter has a simple type), and the second one is to fetch parameter
type from the manifest on rpcbinding file generation if needed (we always
have manifest at this stage, thus it's not a problem to retrieve necessary
information). The latter case is chosen to reduce the bindings configuration
file size.

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

cli/smartcontract/testdata/nameservice/nns.go

@@ -13,6 +13,7 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 	"math/big"
+	"unicode/utf8"
 )
 
 // Hash contains contract hash.

cli/smartcontract/testdata/notifications/rpcbindings.out

@@ -11,6 +11,7 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 	"math/big"
+	"unicode/utf8"
 )
 
 // Hash contains contract hash.

pkg/compiler/compiler.go

@@ -347,8 +347,6 @@ func CompileAndSave(src string, o *Options) ([]byte, error) {
 			eStructName := rpcbinding.ToEventBindingName(e.Name)
 			for _, p := range e.Parameters {
 				pStructName := rpcbinding.ToParameterBindingName(p.Name)
-				// TODO: proper imports handling during bindings generation (see utf8 example).
-				// Probably, we should always add p type to the list of types.
 				if p.ExtendedType != nil {
 					pName := eStructName + "." + pStructName
 					cfg.Types[pName] = *p.ExtendedType

pkg/smartcontract/rpcbinding/binding.go

@@ -693,8 +693,9 @@ func scTemplateToRPC(cfg binding.Config, ctr ContractTmpl, imports map[string]st
 			)
 			if extType, ok = cfg.Types[fullPName]; !ok {
 				extType = binding.ExtendedType{
-					Base: abiEvent.Parameters[i].Type, // TODO: properly handle imports for this case (see utf8 example)
+					Base: abiEvent.Parameters[i].Type,
 				}
+				addETImports(extType, ctr.NamedTypes, imports)
 			}
 			eTmp.Parameters = append(eTmp.Parameters, EventParamTmpl{
 				ParamTmpl: binding.ParamTmpl{